Utility knife



FIG. 1 is a front, top and right side perspective view of the utility knife showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in FIGS. 1-6 are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a utility knife, as shown and described. 